:root{
    --bg:#ffffff;
    --bg-soft:#fffafa;
    --bg-glow:#fff3f3;
    --text:#111111;
    --text-soft:#3d3d3d;
    --primary:#8a1c1c;
    --primary-dark:#6e1111;
    --primary-light:#b63a3a;
    --border:#8a1c1c;
    --border-soft:rgba(138,28,28,.16);
    --muted:#6f6f6f;
    --soft:#f8f8f8;
    --soft2:#fff7f7;
    --card:#ffffff;
    --shadow:0 20px 60px rgba(0,0,0,.07);
    --shadow-soft:0 10px 30px rgba(138,28,28,.08);
    --radius:22px;
    --radius-lg:28px;
    --blur:16px;
    --transition:.28s ease;
}

*{
    box-sizing:border-box;
}

html,
body{
    margin:0;
    padding:0;
    font-family:Tahoma, Arial, sans-serif;
    background:
        radial-gradient(circle at top right, rgba(182,58,58,.08), transparent 24%),
        radial-gradient(circle at bottom left, rgba(138,28,28,.06), transparent 22%),
        linear-gradient(180deg, #ffffff 0%, #fffdfd 50%, #fff8f8 100%);
    color:var(--text);
    scroll-behavior:smooth;
}

body{
    min-height:100vh;
    overflow:hidden;
}

a{
    text-decoration:none;
    color:inherit;
}

img{
    max-width:100%;
    display:block;
}

.brand-logo img,
.welcome-icon img,
.logo-avatar img{
    width:100%;
    height:100%;
    object-fit:cover;
    border-radius:inherit;
}

.logo-avatar,
.welcome-icon{
    overflow:hidden;
}

.app-shell{
    min-height:100vh;
    display:grid;
    grid-template-columns:330px 1fr;
    background:transparent;
    position:relative;
}

.app-shell::before{
    content:"";
    position:fixed;
    inset:0;
    pointer-events:none;
    background:
        radial-gradient(circle at 20% 10%, rgba(138,28,28,.05), transparent 18%),
        radial-gradient(circle at 85% 85%, rgba(182,58,58,.06), transparent 20%);
    z-index:0;
}

.sidebar{
    position:relative;
    z-index:2;
    border-left:1px solid var(--border-soft);
    background:rgba(255,255,255,.78);
    backdrop-filter:blur(var(--blur));
    -webkit-backdrop-filter:blur(var(--blur));
    display:flex;
    flex-direction:column;
    padding:22px 18px;
    box-shadow:0 0 40px rgba(138,28,28,.04);
    animation:slideRightFade .7s ease;
}

.sidebar-top{
    display:flex;
    flex-direction:column;
    gap:18px;
    margin-bottom:22px;
}

.brand-box{
    display:flex;
    align-items:center;
    gap:14px;
    padding:16px;
    border:1px solid rgba(138,28,28,.18);
    border-radius:20px;
    background:linear-gradient(135deg, rgba(255,247,247,.95), rgba(255,255,255,.95));
    box-shadow:var(--shadow-soft);
    transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.brand-box:hover{
    transform:translateY(-2px);
    box-shadow:0 18px 40px rgba(138,28,28,.12);
    border-color:rgba(138,28,28,.28);
}

.brand-logo{
    width:58px;
    height:58px;
    border-radius:18px;
    background:#fff;
    border:2px solid var(--border);
    display:flex;
    align-items:center;
    justify-content:center;
    color:var(--primary);
    font-size:24px;
    font-weight:bold;
    overflow:hidden;
    box-shadow:0 10px 25px rgba(138,28,28,.12);
}

.brand-text h1{
    margin:0 0 6px;
    font-size:24px;
    color:var(--text);
    letter-spacing:.2px;
}

.brand-text p{
    margin:0;
    color:var(--muted);
    font-size:13px;
}

.new-chat-btn{
    display:flex;
    align-items:center;
    justify-content:center;
    gap:10px;
    width:100%;
    padding:15px 16px;
    background:linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color:#fff;
    border-radius:16px;
    text-align:center;
    font-weight:bold;
    box-shadow:0 14px 28px rgba(138,28,28,.22);
    transition:transform var(--transition), box-shadow var(--transition), filter var(--transition);
    position:relative;
    overflow:hidden;
}

.new-chat-btn::before{
    content:"";
    position:absolute;
    top:0;
    right:-120%;
    width:100%;
    height:100%;
    background:linear-gradient(90deg, transparent, rgba(255,255,255,.18), transparent);
    transition:right .55s ease;
}

.new-chat-btn:hover{
    transform:translateY(-2px);
    box-shadow:0 18px 34px rgba(138,28,28,.28);
    filter:saturate(1.03);
}

.new-chat-btn:hover::before{
    right:120%;
}

.sidebar-section{
    flex:1;
    overflow:auto;
    padding-left:4px;
}

.sidebar-section::-webkit-scrollbar{
    width:7px;
}

.sidebar-section::-webkit-scrollbar-thumb{
    background:rgba(138,28,28,.18);
    border-radius:20px;
}

.sidebar-label{
    font-size:13px;
    color:var(--muted);
    margin-bottom:12px;
    padding-inline:4px;
}

.session-list{
    display:flex;
    flex-direction:column;
    gap:10px;
}

.session-item{
    display:block;
    padding:14px;
    border:1px solid rgba(138,28,28,.14);
    border-radius:16px;
    background:rgba(255,255,255,.92);
    transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition), background var(--transition);
    cursor:pointer;
}

.session-item:hover{
    transform:translateY(-2px);
    border-color:rgba(138,28,28,.24);
    box-shadow:0 10px 24px rgba(138,28,28,.08);
    background:#fffafa;
}

.session-item.active{
    border:2px solid var(--border);
    background:linear-gradient(135deg, #fff7f7 0%, #ffffff 100%);
    box-shadow:0 14px 28px rgba(138,28,28,.10);
}

.session-title{
    font-size:14px;
    font-weight:bold;
    margin-bottom:6px;
    color:var(--text);
}

.session-meta{
    font-size:12px;
    color:var(--muted);
}

.empty-side-note,
.small-note{
    font-size:13px;
    color:var(--muted);
    line-height:1.9;
}

.sidebar-footer{
    padding-top:18px;
    border-top:1px solid rgba(138,28,28,.10);
    margin-top:20px;
}

.chat-layout{
    position:relative;
    z-index:2;
    display:flex;
    flex-direction:column;
    min-width:0;
    background:transparent;
    animation:fadeUp .7s ease;
}

.chat-topbar{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:20px;
    padding:24px 30px;
    border-bottom:1px solid rgba(138,28,28,.10);
    background:rgba(255,255,255,.72);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
}

.chat-topbar h2{
    margin:0 0 8px;
    font-size:30px;
    color:var(--text);
}

.chat-topbar p{
    margin:0;
    color:var(--muted);
    font-size:14px;
    max-width:620px;
}

.topbar-left{
    display:flex;
    flex-direction:column;
    gap:4px;
}

.topbar-right{
    display:flex;
    align-items:center;
    gap:12px;
    flex-wrap:wrap;
}

.topbar-badge{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:10px 14px;
    border-radius:999px;
    background:#fff;
    border:1px solid rgba(138,28,28,.18);
    color:var(--primary);
    font-size:13px;
    font-weight:bold;
    box-shadow:0 10px 24px rgba(138,28,28,.08);
}

.topbar-badge::before{
    content:"";
    width:9px;
    height:9px;
    border-radius:50%;
    background:var(--primary-light);
    box-shadow:0 0 0 6px rgba(182,58,58,.12);
    animation:blinkSoft 1.4s ease-in-out infinite;
}

.topbar-new-chat{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    padding:11px 16px;
    border-radius:999px;
    background:linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color:#fff;
    font-size:13px;
    font-weight:bold;
    box-shadow:0 12px 24px rgba(138,28,28,.18);
    transition:transform var(--transition), box-shadow var(--transition);
}

.topbar-new-chat:hover{
    transform:translateY(-2px);
    box-shadow:0 18px 30px rgba(138,28,28,.24);
}

.chat-content{
    display:flex;
    flex-direction:column;
    height:calc(100vh - 98px);
}

.chat-box{
    flex:1;
    overflow-y:auto;
    padding:34px 34px 24px;
    background:linear-gradient(to bottom, rgba(255,255,255,.75) 0%, rgba(255,250,250,.85) 100%);
}

.chat-box::-webkit-scrollbar{
    width:9px;
}

.chat-box::-webkit-scrollbar-thumb{
    background:rgba(138,28,28,.16);
    border-radius:20px;
}

.msg{
    display:flex;
    gap:14px;
    margin-bottom:24px;
    align-items:flex-start;
    animation:messageIn .35s ease;
}

.msg-avatar{
    width:44px;
    height:44px;
    min-width:44px;
    border-radius:14px;
    border:2px solid var(--border);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:13px;
    font-weight:bold;
    color:var(--primary);
    background:#fff;
    box-shadow:0 12px 24px rgba(138,28,28,.10);
}

.msg-body{
    flex:1;
    min-width:0;
}

.msg-bubble{
    max-width:900px;
    padding:17px 20px;
    border-radius:20px;
    line-height:2;
    white-space:pre-wrap;
    word-break:break-word;
    box-shadow:var(--shadow);
    transition:transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.msg-bubble:hover{
    transform:translateY(-1px);
    box-shadow:0 18px 40px rgba(0,0,0,.08);
}

.msg.user .msg-bubble{
    background:rgba(255,255,255,.95);
    border:1px solid rgba(138,28,28,.18);
}

.msg.bot .msg-bubble{
    background:linear-gradient(135deg, #fff9f9 0%, #fff3f3 100%);
    border:1px solid rgba(138,28,28,.28);
}

.welcome-box{
    position:relative;
    max-width:820px;
    margin:50px auto 24px;
    background:rgba(255,255,255,.88);
    border:1px solid rgba(138,28,28,.16);
    border-radius:28px;
    padding:38px 34px;
    text-align:center;
    box-shadow:0 24px 60px rgba(138,28,28,.09);
    overflow:hidden;
    animation:welcomePulse 4s ease-in-out infinite;
}

.welcome-box::before{
    content:"";
    position:absolute;
    inset:auto -40px -40px auto;
    width:160px;
    height:160px;
    border-radius:50%;
    background:radial-gradient(circle, rgba(138,28,28,.08), transparent 68%);
    pointer-events:none;
}

.welcome-box::after{
    content:"";
    position:absolute;
    inset:-50px auto auto -50px;
    width:160px;
    height:160px;
    border-radius:50%;
    background:radial-gradient(circle, rgba(182,58,58,.08), transparent 68%);
    pointer-events:none;
}

.welcome-icon{
    width:78px;
    height:78px;
    margin:0 auto 18px;
    border-radius:22px;
    background:#fff;
    color:var(--primary);
    border:2px solid var(--border);
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:28px;
    font-weight:bold;
    overflow:hidden;
    box-shadow:0 16px 32px rgba(138,28,28,.14);
    animation:floatIcon 3s ease-in-out infinite;
}

.welcome-box h3{
    margin:0 0 12px;
    font-size:34px;
    color:var(--text);
    position:relative;
    z-index:2;
}

.welcome-box p{
    margin:0;
    color:var(--text-soft);
    line-height:2.1;
    font-size:16px;
    max-width:680px;
    margin-inline:auto;
    position:relative;
    z-index:2;
}

.quick-prompts{
    display:flex;
    flex-wrap:wrap;
    justify-content:center;
    gap:12px;
    margin-top:24px;
    position:relative;
    z-index:2;
}

.quick-prompt{
    border:none;
    background:linear-gradient(135deg, #ffffff 0%, #fff7f7 100%);
    color:var(--primary);
    border:1px solid rgba(138,28,28,.18);
    padding:12px 16px;
    border-radius:999px;
    font-size:14px;
    font-weight:bold;
    cursor:pointer;
    box-shadow:0 10px 20px rgba(138,28,28,.06);
    transition:transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}

.quick-prompt:hover{
    transform:translateY(-2px);
    background:#fff2f2;
    border-color:rgba(138,28,28,.30);
    box-shadow:0 16px 28px rgba(138,28,28,.10);
}

.chat-form-wrap{
    padding:18px 24px 24px;
    background:rgba(255,255,255,.86);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-top:1px solid rgba(138,28,28,.10);
}

.commands-note{
    max-width:1040px;
    margin:0 auto 10px;
    color:var(--muted);
    font-size:13px;
    text-align:right;
}

.chat-form{
    max-width:1040px;
    margin:0 auto;
}

.composer-box{
    display:flex;
    gap:14px;
    align-items:flex-end;
    padding:14px;
    border:1px solid rgba(138,28,28,.22);
    border-radius:24px;
    background:rgba(255,255,255,.96);
    box-shadow:0 18px 45px rgba(138,28,28,.10);
    transition:border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}

.composer-box:focus-within{
    border-color:rgba(138,28,28,.45);
    box-shadow:0 24px 54px rgba(138,28,28,.16);
    transform:translateY(-1px);
}

.composer-inner{
    display:flex;
    flex-direction:column;
    flex:1;
    min-width:0;
}

.chat-textarea{
    flex:1;
    min-height:62px;
    max-height:180px;
    resize:none;
    border:none;
    outline:none;
    font-size:16px;
    color:var(--text);
    background:transparent;
    font-family:Tahoma, Arial, sans-serif;
    line-height:1.9;
}

.chat-textarea::placeholder{
    color:#9a9a9a;
}

.composer-hint{
    margin-top:8px;
    font-size:12px;
    color:var(--muted);
    padding-inline:4px;
}

.chat-btn{
    border:none;
    background:linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color:#fff;
    padding:15px 24px;
    border-radius:16px;
    cursor:pointer;
    font-size:16px;
    font-weight:bold;
    min-width:124px;
    box-shadow:0 12px 28px rgba(138,28,28,.20);
    transition:transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.chat-btn:hover{
    transform:translateY(-2px) scale(1.01);
    box-shadow:0 18px 34px rgba(138,28,28,.26);
    opacity:.98;
}

.chat-btn:active{
    transform:translateY(0);
}

.loading{
    margin-top:12px;
    color:var(--primary);
    font-size:14px;
    text-align:right;
    animation:blinkSoft 1.2s ease-in-out infinite;
}

.typing-msg{
    opacity:.95;
}

.typing-bubble{
    display:inline-flex;
    align-items:center;
    gap:7px;
    min-width:78px;
    justify-content:center;
}

.typing-bubble span{
    width:9px;
    height:9px;
    border-radius:50%;
    background:var(--primary-light);
    display:inline-block;
    animation:typingDots 1.2s infinite ease-in-out;
}

.typing-bubble span:nth-child(2){
    animation-delay:.18s;
}

.typing-bubble span:nth-child(3){
    animation-delay:.36s;
}

@keyframes slideRightFade{
    from{
        opacity:0;
        transform:translateX(18px);
    }
    to{
        opacity:1;
        transform:translateX(0);
    }
}

@keyframes fadeUp{
    from{
        opacity:0;
        transform:translateY(18px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}

@keyframes messageIn{
    from{
        opacity:0;
        transform:translateY(10px) scale(.99);
    }
    to{
        opacity:1;
        transform:translateY(0) scale(1);
    }
}

@keyframes floatIcon{
    0%,100%{
        transform:translateY(0);
    }
    50%{
        transform:translateY(-6px);
    }
}

@keyframes blinkSoft{
    0%,100%{
        opacity:.45;
    }
    50%{
        opacity:1;
    }
}

@keyframes welcomePulse{
    0%,100%{
        box-shadow:0 24px 60px rgba(138,28,28,.08);
    }
    50%{
        box-shadow:0 28px 70px rgba(138,28,28,.13);
    }
}

@keyframes typingDots{
    0%,80%,100%{
        transform:scale(.7);
        opacity:.45;
    }
    40%{
        transform:scale(1);
        opacity:1;
    }
}

@media (max-width:1100px){
    body{
        overflow:auto;
    }

    .app-shell{
        grid-template-columns:1fr;
    }

    .sidebar{
        display:none;
    }

    .chat-content{
        height:auto;
        min-height:calc(100vh - 88px);
    }

    .chat-box{
        min-height:calc(100vh - 220px);
    }
}

@media (max-width:768px){
    .chat-topbar{
        padding:18px 16px;
    }

    .chat-topbar h2{
        font-size:25px;
    }

    .chat-box{
        padding:20px 14px 18px;
    }

    .chat-form-wrap{
        padding:14px;
    }

    .composer-box{
        flex-direction:column;
        align-items:stretch;
        border-radius:20px;
    }

    .chat-btn{
        width:100%;
    }

    .msg{
        gap:10px;
    }

    .msg-avatar{
        width:40px;
        height:40px;
        min-width:40px;
    }

    .msg-bubble{
        max-width:100%;
        padding:15px 16px;
        border-radius:18px;
        line-height:1.95;
    }

    .welcome-box{
        margin-top:24px;
        padding:26px 18px;
        border-radius:24px;
    }

    .welcome-box h3{
        font-size:26px;
    }

    .welcome-box p{
        font-size:15px;
        line-height:2;
    }

    .welcome-icon{
        width:72px;
        height:72px;
    }

    .topbar-right{
        width:100%;
        justify-content:flex-start;
    }

    .topbar-new-chat{
        width:100%;
    }
}

.session-item{
    position:relative;
}

.session-link{
    display:block;
    color:inherit;
}

.session-delete{
    position:absolute;
    top:8px;
    left:10px;
    width:24px;
    height:24px;
    border-radius:50%;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#999;
    background:rgba(255,255,255,.8);
    font-size:16px;
    line-height:1;
    transition:var(--transition);
}

.session-delete:hover{
    color:#fff;
    background:var(--primary);
}